According to the nebular theory, what happens to a nebula as it contracts under the force of gravity?

Nebular Theory explains how the solar system was formed.  

The Nebular Theory says a nebula is a cloud of gas or ionized gas, formed with cosmic dust.

As a nebula contracts under the force of gravity it collapses and it will make the particles agglutinate in the centre of the nebula given rise for the formation of stars.

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